There IS no substitute for parenting, or for trust !
I'm sorry, and it's not what you want to hear, but it's totally insane to 'track' your children, where would it end ?
Would you still be covertly tracking them at university ? or on a night out ? ( have seen plenty on mumsnet about people tracking partners etc)
There is no end to the cycle once it starts. Comments such as ' I'm only doing it to keep you safe' or ' I need to know where you are so I won't worry' are the excuses trotted out by the people who either don't know how to, or are too lazy to teach their children the skills they need to be able to protect themselves from predators or danger of any kind.
A perfect example is a mum I know, who tracks her DC's phone and drives round to where DC is, to check he's safe down at the riverside park, and yet hasn't got the time or energy to teach DC to swim !!!! Also hasn't taught him any strategies about how to get away from strangers or what to do if an older kid tells him to do something dangerous etc
Be a responsible parent and TEACH LIFE SKILLS to your children instead of tracking them with technology !
If you don't, you'll never be able to stop the 'tracking' cos, as a parent, you NEVER stop worrying, but you DO have to learn how to trust your children and trust that you have taught them about safety/ risks/ what to do in an emergency etc cos unfortunately all you parents will not actually live forever and be able to protect your DC from every danger forever, but you CAN teach THEM how to protect themselves !
Also, how can your children ever feel confident in their own abilities or to be independent and negotiate life's dangers themselves if you insist they need your intervention to keep them safe ? You should be empowering your children, not keeping them from being self reliant.
It is not your child's problem if you can't relax unless you know exactly where they are, each moment of the day, IT'S YOURS ! Our children should not need to comply with your wish to track them simply to ease YOUR mind. As a parent, you HAVE to learn to let go, a little bit at a time as your child',s abilities and confidence grows.
It's not easy to let go, but it IS essential, unless you want to see your son and daughters in law on mumsnet complaining about their overbearing and controlling mother in law !
Your choice.........